why eplace cannot optimize Innovus's result anymore

[tigereatsheep]

I just implemented a placement tool(eplace based, like openroad), and I use this tool to optimize innovus's placement result, it just stalled, so wired

[maliberty]

Perhaps there is no further improvement to be had? I'm not sure how this relates to OR.

[maliberty]

I can't comment on other tools or their results. Are you using -routability in OR?

[tigereatsheep]

No, but I've read the source code, -routability only change the overflow/targetdensity parameters, this do little help to solve congestion in my own "eplace based" tools.

[maliberty]

It bloats the cells which spreads them out more in the congested areas.

[tigereatsheep]

Hi Matt, Thank you very much. OR solved the congestion problem, the core area util of design is 68%, I just set the target density from 1.0 to 0.71 and the congestion rate down from 15% to 2%. OR is really amazing project

[maliberty]

I'm glad you found a solution.